feat(tests): add eval tests for darwin systems

outputs/aarch64-darwin/tests/home-manager/expected.nix

@@ -0,0 +1,10 @@
+{
+  myvars,
+  lib,
+}: let
+  username = myvars.username;
+  hosts = [
+    "fern"
+  ];
+in
+  lib.genAttrs hosts (_: "/Users/${username}")

outputs/aarch64-darwin/tests/home-manager/expr.nix

@@ -0,0 +1,15 @@
+{
+  myvars,
+  lib,
+  outputs,
+}: let
+  username = myvars.username;
+  hosts = [
+    "fern"
+  ];
+in
+  lib.genAttrs
+  hosts
+  (
+    name: outputs.darwinConfigurations.${name}.config.home-manager.users.${username}.home.homeDirectory
+  )

outputs/aarch64-darwin/tests/hostname/expected.nix

@@ -0,0 +1,8 @@
+{
+  lib,
+  outputs,
+}: let
+  hostsNames = builtins.attrNames outputs.darwinConfigurations;
+  expected = lib.genAttrs hostsNames (name: name);
+in
+  expected

outputs/aarch64-darwin/tests/hostname/expr.nix

@@ -0,0 +1,9 @@
+{
+  lib,
+  outputs,
+}:
+lib.genAttrs
+(builtins.attrNames outputs.darwinConfigurations)
+(
+  name: outputs.darwinConfigurations.${name}.config.networking.hostName
+)